Air compressor



Apwfifi 39, 935. H. L. BROOKING AIR' COMPRESSOR Filed Nov. 8, 1952 m Wm E m m m .qw E A Patented Apr. 30, 1935 v ssue's ear 1,999,498 I Am COMPRESSOR Harry Breaking, Derby, Kans.

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f1 Claim. (01. 230-58) inv ntionrelates to improvements in com- The object invention is to provide a multiple pump and-actuating means therefor.

A iurther object my invention is to provide a power actuating means for each pump such that the piston connection at highest point of pressure will approach the axis or" the drive whereby the mechanical advantage is gradually increased to resist the increase of the compressor at its maximum point.

A still further object or" my invention is to provide a compressor inexpens've to construct, simple operation, the rotatable parts being housed to run oil to maintain proper and continuous lubrication.

These and other objects will hereinafter be more fully explained, reference being had to the ace inpanying drawing forming a part of this specification, in which like characters will apply to like parts in the different views.

Referring to the drawing:

Fig. i is a side elevation of the compressor, and a tank iragmentarily shown.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is an enlarged sectional view longitudinally thru the pump cylinders and fragmentary portion of a tank.

Fig. 4. is an upper end view of the pump cylinders, cap removed and piston rods in cross section.

Fig. 5 is a side view of the pitman drive.

Fig. 6 is an edge View of Fig. 5.

Fig. '7 is an enlarged plan view of one of the cross-heads. v

Fig. 8 is an end view of one of the cross heads showing the pivotal attachment of the pitman thereto, the nut, washer, pitman being in cross section.

My invention herein disclosed consists of a pump having a pair of cylinders I positioned in parallelism and having a base flange 2 as attaching means for the pump to a tank. 3,.each cylinder equipped with a piston head 4 and piston rod fi respectively, and means later described for alternate reciprocating movement of the pistons. The said pistons are pivotally connected to the outer ends of their respective pitmen 5" as shown in Fig. 1 at 5". v

Spaced a short distance upward from the lower end of each cylinder a check valve 5 as an in take for the cylinders, the said valve being of a ball type gravity actuated toward the seat.

Axially aligned to seat in the lower end of each cylinder is a check valve comprising a ball I 1932, Serial Nat an actuated by'a spring 3. The said valve being designed to retain the pressure in the tank-created y the u pr Verticallyaligned with the pump cylinders is a housing 9 supported by legs it in working relation to the said pump cylinders and in which is trunnioned a pair of pitman wheels H later described. Downwardly extending from the said housing is a neck portion l2 in which the upper ends of the piston rods slidably engage reciprocatingly; Positioned at one side of the housing is a motor is having a worm Hi to engage with a worm gear 55. The said gear being positioned between the pitman wheels as rotating means therefor thru worm. The said worm gear and pitman wheels are secured to a shaft it that is trunnioned in bearings ll that are secured to the housing, it being understood for convenience of assembly the housing 9 is divided diametrically as shown in Fig. 1 and secured by bolts i8 engaging thru flanges l9 that are integral with their respective portion of the housing. I have also arranged a pack ing gland 263 for each ofthe piston rods as oil tight means for the housing. On the top of the housing I have arranged a removable stud 2| threadedly engaging in the housing by which means the housing may be charged with oil.

Each of the pitman wheels has a groove 22 diametrically crossing the said wheel transversely cross section, the outer or reduced portion of the grooves being formed by a plate 23 secured to the wheel body by cap screws 24, by which means the marginal overlap of the sides of the plate adjacent the groove will secure the cross-heads 25 from outward movement, but permit the same to move with a smooth running fit as the wheels rotate.

To cause alternate reciprocation of the pistons, the cross-heads will be oppositely positioned in the other wheel with respect to the position shown in Fig. 5, and being so arranged, the position of the pistons will be as shown in Fig. 3.

As the wheels rotate, the pivot point A of the pitman on its respective cross-head is the fulcrum point to slide the other cross-head in its respective groove as shown by dotted lines B, and

in such position the pitmans relative position to the vertical line C is that shown by dotted line D as the wheel rotates in the direction of the arrow.

When cross-head E that is pivoted to the end of the pitman has moved to the extremity along its respective groove, cross-head F that is intermediately positioned to the said pitman will autothe medium of the motor driven to each other, the said grooves being T-shaped in r matically locate itself in the center of the wheel, and by further movement in the same direction, the retraction of cross-head E will be affected and forced to the opposite end portion of its groove, and so on reciprocatingly as the wheel rotates. At each complete revolution, the pitman will deliver two complete outward strokes.

It is now clearly shown how four strokes of the pistons are accomplished per revolution of the power transmitting wheels, and at all times the high pressure point of each piston head is actuated by an increase of power by reason of the cross-heads approach toward the axis of the wheel, therefore the resistance of the compression is equalized by the increase of power thus accomplished.

While I have shown the pump mechanism positioned at right angles with respect to the-tank as shown in Fig. 1, I do not wish to be restricted to such alone as other positions may be adopted and made to work with equal efiiciency and the exact form of the T-shaped cross-heads may be varied, and such other modifications may be employed as lie within the scope of theappended claim.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:-

A cylindrical housing and means to mount the same on a tank, a pair of cylinders in working relation to the housing and carried by the tank and a motor secured to the tank in working relation to the housing, a worm gear trunnioned in the housing thru the medium of the shaft and being in mesh with a worm on the armature shaft of the motor as actuating means therefor, wheels diametrically grooved on one side and secured to the gear shaft on each outer end thereof and rotatable with the gear, each wheel having a pitman and a pair of cross-heads spaced apart, pivotally connected and adapted to slide in their respective grooves reciprocatingly as the wheels rotate, a headed piston for each of the said cylinders and pivotal means to connect the outer end of each pitman to its respective piston, each cylinder having an intake and exhaust valve in the lower end portion thereofsubstantially as shown and for the purpose specified.

, HARRY L. BROOKING. 

